In-depth look at True Sine Wave UPS operation

[@mmouse648]

Here we are, 13 years later and this is as relevant as the day you made it. Modern UPS's have a few more tricks up their sleeves, but the basics are the same. You did an OUTSTANDING job of explaining it. You made me laugh since I was trained on up to 20Kva Delta UPS's years ago working for a huge computer company, I felt like I was back in class... I remember best my shock when they started the 1st day of class by introducing a Nurse from the local hospital. The Instructor then said before we start, you are all getting trained on CPR! We were all looking around at each other, wondering if we had made the right decision to elect training for UPS's ... :)

[@ilya7zz]

I agree! Very useful at all times)

[@ciprianwinerElectronicManiac]

I've been looking a lot of time for a good explanation to how these things work and you nailed every question I had right in the head! Thanks a lot mate. Cheers.

[@Perplexer1]

Videos like this one are very rare, that's why they're worth gold. Thanks for sharing.

[@XTCBiscuit]

Wow, I can't believe these things were so simple. I just bought one recently, and it was a little more expensive than the modified sinewave version and I thought it must have a lot of whacky gizmo's to make it better. Now I know thanks to your explanations!

[@snaproll94e]

Great video and explanation. I wondered how they make a pure sine output and you completely enlightened me. The charging and input voltage compensation was an unexpected bonus. Thanks!

[@pault609]

Thank you for making this video. I was wondering how sine wave inverters worked, and your explanation was succinct and interesting.

[@tesla500]

@filipkof Glad you liked it! True sine UPSs aren't really that important unless you're running a motor. PCs and other things with switching power supplies work just fine on a square wave. LC filters are used in very large (100s of megawatts) inverters on the end of DC power transmission lines, but I think they use more than just a 3 step waveform like traditional UPSs put out.

[@dsponline_0]

That is multilevel inverter.

[@Spahija42]

I really appreciate this explanation. It's one of the easiest to follow I've seen.

[@FFcossag]

Great video, I really enjoyed seeing those scope screenshots, especially of the (APC patented) battery charger circuit. It's a shame they don't use it to its full potential in most of their units, implementing 3-step charging/equalisation would be so easy to do in software.

[@davidca96]

This is a very informative video thank you, you explained things at a good pace, and drawing as well as showing really helps. I have always wanted to see the ripple in the ups sinewave output.

[@Aussie50]

Excellent demonstration!, I've learned a lot from that!. thanks!

[@nookso-ry4zb]

Thank you for excellent demonstration video! Its very easy to understand principles of UPS sine forming and charse process. It was dark forest to me, and now its pretty clear. And yeah, its genious scematics. Спасибо за прекрасное видео объясняющее принцип работы ИБП :)

[@sonjakavalut]

Thank you for all your wonderful videos. Best luck and respectful greetings from Slovenia.

[@originalradman9491]

I was really interested in how much noise and ripple was in the output from a switching UPS. I have an SUA1500 which is also rated as "true sine wave" and was curious how good the "stepping" really was. While my model is not the same it's definitely in the same family and gives me an idea of how well it will work with typical electronics. Thanks!

[@PodeCoet]

Wish you'd post more often man! Your videos and explanations are brilliant

[@studuatiga]

very good video... I can learn many things I couldn't easily find from other sources.

[@igorparkman]

Excellent and straight forward explanation!

[@tpmbe]

excellent description ...many thanks

[@whitcwa]

Another great video! I had ten of nearly isdentical SU3000RMT3U by APC. The first time they were shipped all of them were bad because the transformers had ripped their machine screws out of the thin sheet metal. The second shipment had 6 bad ones for the same reason. They were pretty good, but the "Smart Boost" feature caused a delay in switching to battery power. There was one UPS for each linear power supply in our Solid State Logic audio console. By the time they had switched to battery, the console power supplies sometimes switched off. The console could run on two supplies, but on one supply it would blow a fuse. The fix came when we got a building-wide UPS and recycled the APC's. I wonder if feeding a linear supply made it harder to determine an outage. It sounds like they fixed the problem by going to battery power before changing taps.

[@MichaelMaundu]

Great video, much appreciated.

[@pauldedula4916]

finally, a good video explaining this!

[@Maxxarcade]

Awesome video! What model UPS is that? That's a really sweet scope you have there. I'm still using a 10Mhz analog one.

[@kofi]

I was curious about how these works. Thanks for this video it really helped me to understand that. I wasn't expecting something like PWM to make the sinewave. I wanted to modify my modified-sinewave inverter to produce the true sinewave simply by adding a LC on the output, which really worked but it consumed about 40% of power so it was very bad solution and i removed it. To construct this, it will be much more difficult for me...

[@tesla500]

@Maxxarcade It's an APC NS3000RMT3U. Yep, these Agilent scopes are very nice, but there's nothing wrong with the older ones, they're perfectly good for a lot of jobs.

[@RussellTuan]

great video!! it give me the motivation to investigate my UPS XD.

[@TheArcV]

Wonderful video! Thanks for making it.

[@johncarl43447]

thanks for explaining in such detail. Very good video!

[@agredo]

I like this video. I have a question: why it matters to have a very pure sine wave if at the end, all or most of the electronics devices (Tv, audio, etc) internally converts to DC to work with 5,12 VDC ?

[@zkkzkk32312]

Thank you for the really nice video, Questions: if a line-Interactive UPS is labeled with "perfect sine wave" generating abilities, does it mean i can get perfect sine wave all the time even when i am not using the battery? does perfect sine wave equals to clean power? if the above are positive, why would any1 need a "on-line" UPS at all?

[@MrKadidle51]

Thanks for the info my man. Question. With a high end UPS like an Eaton 9355 or similar would it be possible to synchronize the sine wave with a generator or is the nature of the sine wave a UPS puts out and that a generator make something impossible or not economical? The reason I ask is because of someone is wanting a long back up time like an hour on a larger unit, like 100kva or so it's not economical to do so with batteries or at least not really viable from a cost and foot print perspective.

[@douro20]

I wonder how the Xantrex ProWatt UPSs do this...I understand that they use a very different way of generating the output which doesn't use transformers, but special high-frequency circuitry.

[@tiagomacieira3618]

Nice Video!! I have an identical APC ups, which burned the ic's. and I'm trying to replicate the operation with an Arduino Mega. could you explain in more detail the part of the battery charge. thank you

[@woo216]

thanks bro, this helped heaps. I saw some other circuit diagrams and each MOSFET had a free wheeling diodes across it, what are those diodes for?

[@drkastenbrot]

Afaik those protect the mosfets. When switching coils off, evil induced voltages appear and they can easily break sensitive parts like mosfets. The diodes short out those spikes so the mosfets dont die.

[@pcuser80]

Excellent video thanks I have a the same here European model 220V 50HZ only the batteries are dead. The auto change voltage is like a auto tap on a street transformer.

[@costi08]

About 7:40 if you got lower voltage you woult have more turns to rise the voltage and vice versa. So, if voltage is high mid-off down-on, if low mid-off up-on. Sorry if I'm wrong.

[@AbdullahKahramanPhD]

Thank you for this very informative video!

[@RogerBarraud]

Great vid - thanks! :-) Is that amount of droop (at peak of output sine) on the lower trace normal, or was this a UPS with a lazy battery/input C's?

[@flashback9966]

Excellent video

[@teravolt1195]

Wow very informal, thank you!

[@lloydprunier4415]

Will a Tripp-Lite LC 1200 line conditioner change a square wave to a sine wave? Is there any way to check the output of a inverter other than a scope or seeing if an appliance will burn up?

[@sattibabu5889]

thanks for making this video

[@aterack833]

how close could i get without the step up phase? like if you hook the drive wires in a way that they provide their power just to a bipolar cap and look at the oscilloscope reading, how sine like is it? im making a hf style inverter, you know the cheap ones, but with a buck boost converter for the input, so i can use 5v up to 600v to charge the cap bank but im having power leads go from there to a 120 or so volt battery bank so i can have high currents but only need a small current for the buck/boost stage, and so i can run it like a ups without needing to sync to the mains

[@electroumit]

Thank you so much.

[@mickpr]

Good work :)

[@rezatibil07]

so . is that okay using non pure sine wave ups in apfc psu ?

[@LastHumanStanding]

Building a 28VDC battery bank for mobile power driven from a surplus mil 28VDC generator. Have some large UPS's to use and lots of questions. Any chance you are still around and I could pick your brain? Would love any and all help with design of concept.

[@joeambly6807]

i can help for 1 million dollarz

[@IQALAaudio]

so there are no "TRUE" sine wave inverter ....

[@liquidextal]

+Indra Q You can use transistors in their linear range to get a true sine wave output (similar to a class A audio amplifier) but it's far less efficient.

[@monton60]

Thank for idea .

[@rrgiri]

fantastic :)

[@functionifelse]

Awesome

[@thegreatga]

Funny how this statement was true to the time, but modern high efficiency power supplies in pcs require true sine wave or they won't work. I'm referring to stuff like 80 plug gold. Some of the older ups units wont work with modern computer powers supplies.

[@timlipinski2571]

Great video and for more detail on the charging of the batteries check out the channel EEVblog#504 on KZbin ! On tesla500 other video was labeled "APC 3kVA 208V sine wave UPS" and this looks the same. Eyes UP and lights down, tjl Sent by Win7Pro64 w/ADSL

[@ABC-wu3jz]

Digital sine wave is not perfect but never perfect because of 0 1 1 0 digital switch .The very true pure sine wave is from ac generator that generates sine wave without stepps

[@tesla500]

+Camaracta Sanctis Theoretically yes, but show me a power generator that produces a sine wave better than this. This is better than any wave I've seen come out of the wall socket, that's for sure. It's all a moot point anyway, no normal device cares that much about the exact shape of the wave. A square wave output UPS will power your IT equipment just fine.

[@ABC-wu3jz]

tesla500 Yes but the square wave is ineficient and less torque on motors but in digital pulsed sine wave runs motors fine about 98% 99,5% i think

[@aterack833]

+tesla500 they dont care that much but my fridge and my smoke alarms can tell you they didn't like modified sine wave power up till they died from it, reply to find out how they died and my thoughts on why it happened

[@SERGEY-KACHAN]

Модернизация ИБП kzbin.info/www/bejne/hmrIlISZarlpipY